Create containerizing-your-application.md

bundles/kubernetes-101/labs/containerizing-your-application.md

@@ -0,0 +1,59 @@
+# Containerizing your application
+
+In this lab you will build your application, run it locally, and then package it into a container. Containers are more lightweight than a full virtual machine for your app and they package your application so that it runs the same across different environments such as development, QA, and production.
+
+## Get the application code
+
+The first hurdle to is the application itself.  How do you write it?  How do you deploy it?
+
+First set up the code and the Go build environment. For this lab we'll be using an example app from GitHub: [kelseyhightower/app](https://github.com/kelseyhightower/app).
+```bash
+export GOPATH=~/go
+mkdir -p $GOPATH/src/github.com/kelseyhightower
+cd ~/go/src/github.com/kelseyhightower
+git clone https://github.com/kelseyhightower/app
+```
+
+## Build the app
+
+Now let's build the app as a static binary and test its functionality.
+```bash
+cd app/monolith
+# main.go contains our app entry point
+go build -tags netgo -ldflags "-extldflags '-lm -lstdc++ -static'" .
+./monolith --http :10180 --health :10181 &
+curl http://127.0.0.1:10180
+curl http://127.0.0.1:10180/secure
+# Yes the password for the next step is 'password'
+TOKEN=$(curl http://127.0.0.1:10180/login -u user | jq -r '.token')
+echo $TOKEN
+curl -H "Authorization: Bearer $TOKEN" http://127.0.0.1:10180/secure
+```
+
+Once we have a binary, we can use Docker to package and distribute it.
+```bash
+docker build -t askcarter/monolith:1.0.0 .
+# Optionally push to Docker Hub using docker push <your_repo>/monolith:1.0.0
+docker run -d askcarter/monolith:1.0.0
+docker ps
+docker inspect <container-id>
+curl http://<docker-ip>
+docker stop <container-id>
+docker rm <container-id>
+docker rmi askcarter/monolith:1.0.0
+```
+
+## Title here
+
+The next hurdle is the infrastructure needed to run manage in production. We'll use Kubernetes (and GKE) to handle that for us.
+
+```bash
+cd ~/kubernetes-workshop/kubernetes
+kubectl run monolith --image askcarter/monolith:1.0.0
+kubectl expose deployment monolith --port 80 --type LoadBalancer
+kubectl scale deployment monolith --replicas 3
+kubectl get service monolith
+curl http://<External-IP>
+kubectl delete services monolith
+kubectl delete deployment monolith
+```